1/2 cup Nutella
2 tablespoons powdered sugar
2 sugared doughnuts, sliced in half
1 kiwi, peeled and thinly sliced
4 strawberries, thinly sliced
1 mango, thinly sliced
Using an electric mixer, beat together the Nutella and powdered sugar until smooth, thickened, and a little stiff. Line a half-sheet pan with waxed paper. Arrange two ring molds or round cookie cutters on the half-sheet pan and divide the Nutella between the two molds, spreading it smooth. Refrigerate for 20 minutes, or until firm.
To assemble the burger, layer in this order: the bottom doughnut "bun," kiwi slices, strawberry slices, Nutella patty, mango slices, and the top doughnut "bun."